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15

4 3
Determine whether 1 , , –9 and 3.5 are rational numbers.
5 4
CHAPTER
1
4 9 3 –9 5
,
,
,
1 = –9 = 3.5 = 3 All the numbers
5 5 4 1 10 can be written in
1 p .
= 3 the form of q
2
7
=
2
Think Smart
4 3
Thus, 1 , , –9 and 3.5 are rational numbers. Is 3.141592654… a
5 4 rational number? Explain.
Self Practice 1.5a

1. Determine whether the following numbers are rational numbers. Explain your answer.
–2 , 8 , –1.2 , 7.65, 2 2 , – 4.2
4 7 1.5 5

How do you perform computations involving
combined basic arithmetic operations of LEARNING
STANDARDS
rational numbers? Perform computations
involving combined basic
16 arithmetic operations
of rational numbers by
Solve each of the following:
following the order
1 1 7 of operations.
1
4
1
3
(a) –0. 4 + 1 × – 2 (b) 18 × – 2 + 1.5 ÷ 0.3
2 8 12

1 1 7
3
1
1
4
(a) –0. 4 + 1 × – 2 (b) 18 × – 2 + 1.5 ÷ 0.3
2 8 12
3
4 3 1 Convert 18 7 3 3
1
1
= – + × – 2 decimals into = 3 × – 2 + 4 ÷
10 2 8 1 12 2 10
fractions first. 2
4 3
1
1
= – + – 2 = – 21 + 3 2 ÷ 3
10 16 2 2 10
32 15 Follow the order 18 3
= – – = – ÷
80 80 of operations 2 10
47 ( ) 9 3 10
= – = – ×
80 1 3
× or ÷ 1
= –30
+ or –
24
Chapter 1
01 TB Math F1.indd 24 10/20/16 11:55 AM